Like the message says - your driver doesn't support either framebuffer objects or GLX 1.3 (or at least the pbuffer part that's required). Unfortunately this is not something I can realistically work around - your best bet is to encourage[0] the people working on the driver to add support for off-screen buffers.
Cheers,
Nathan
[0] assuming you can't write the support yourself, I'm sure money and/or beer would be appreciated as the next best thing
